No, you don't, IFF you distribute the source code. Doesn't makea lot of sense though. So consider, a for-profit company licensesQT for a proprietary app. They send bug fixes/enhancements to QTto TrollTech. If these migrate to Free QT, you're ahead of the game.If they don't, what did you lose?

> Which makes no sense. You're not at the mercy of Linus or the> kernel developers, neither at that of the KDE developers, but> TrollTech controls the KDE desktop wrt commercial apps.

No, they don't. KDE uses the GPL for QT. If I build a commercialapp using KDE, it is GPL. If I build a commercial app not usingKDE, but using commercial QT, that has no effect on the KDE desktop.

> What if TrollTech decides to only license (or sell) Qt> to, say, Microsoft? What does that mean for, say, the Kompany ?

They can't. They released the code under GPL. They can stop maintainingthat code, and continue on a proprietary track. If they did, whatdid you lose?

In summary, QT -> GPL, GNOME - GPL, what about _that_ makes one orthe other inherently preferable or better?